2000 5.3/4l60e swap to 2007 6.0/4l80e

alright, Ive done alot of searching and found a lot of good info but not quite what i was looking for. I found a 6.0,4l80e,t-case, wiring harness,computer and gas pedal out of a 2007. I want to put it in my 2000 4x4 1/2 ton with a 5.3/4l60e. how hard or easy or hard is this gonna be? Is there gonna be any issues with there being a 7yr difference between parts? what parts are or are not interchangeable? is everything inside the truck going to work as far as a/c, dash, any type of factory security issues? alot of the swaps ive seen on hear either stay pretty close to the swap year or the newer setups go into pre 90 models. I just want to know if the 2007 is gonna be an issue.

First question is, is it a Gen4 or Gen3 engine? Gen4 will have a grey/white crank sensor behind the starter. Gen3 is black.

I believe its a gen4. I havent picked it up yet so im not sure but when i called the guy and told him what i'm doing he said something about the crank sensor being an issue.

Then you have to account for the cost of a conversion box from Gen4 to Gen3. I believe Lingenfelter markets them and they're $350 or so. You'll most likely need 3/4 ton 80e brackets from your generation of truck to hang the xfer case. The engine/trans isn't that big of a deal, swap parts from the old engine into the new one. The xfer case may be your biggest obstacle other than drivershafts. I think someone on SiveradoSS makes a gear you swap into your old xfer case to mate to the 80 if you want to use it. Depending on if you have electronic, floorshift, dashshift or autotrac can make big issues if not compatible. I've never done the swap before so don't take this as the gospel.

why do I need a "conversion box"? if its because of the crank sensor, I'm getting the computer with the engine so it shouldn't matter, right ? and I know about the crossmember and the driveshafts so thats not a big deal. I have a manual t-case and the seller said that the 2007 t-case is also a manual. but is that possible? I thought GM would have switched them all to electronic by 2007.

conversion box allows you to use your old wiring harness and PCM, easiest of all to do unless you're really good at reading schematics and can wire the Gen4 stuff into your Gen3 truck. You'll have to get the VATS disabled in the PCM for it to run most likely. If you do use the Gen3 stuff you will have to get a tune anyway to get the 80e overlay put into it or to get a 2500/80e tune loaded into it to shift the 80e.

I assumed that there would be some rewiring. I guess I just need to print out the 2 schematics and lay them side by side. I have a 84 chevy truck with a tpi setup and made my own wiring harness for that. So I'm not new to the rewiring game. It also has a twin turbo setup and I did ALL the fab work on that. So I'm hoping this swap will be a breeze.
I am planning to get the HP tuner program and turbo it later. So if there was a VATS issue I could take care of that. But I would like to have the 6.0 (stock) in the truck and all the bugs worked out from the swap before I turbo it. And the tuner program is a nice chunk of change so I would like to wait on that. Wont the factory VATS in my 2000 talk to the VATS in the factory 07 computer. I know I would find out if I just looked, but I figured I would ask for anyone else reading the thread that doesn't have access to that info.

Why do extra work? Just get the conversion box. And that way if for whatever reason you need to replace the harness you don't need to build a whole custom harness again. If you plan on DDing the truck you gotta think about when stuff breaks, cuz it always does, can you afford for it to be down?

the conversion box is only 275.00 shipped. i put a gen IV 5.3 in my 94.

So I wont have to change anything on my 5.3 harness. all I need to do is get the conversion box and reprogram the 5.3 computer for the 6.0? oh yeah, and all the mounting mods. sounds a little to easy. what about all the other sensors on the 07 6.0? are they going to talk to my 00 5.3 computer? I know the 2007 is fly- by-wire.